The Premarc Corporation - Products - CDS Technologies

INLINE UNIT

Polluted storm water runoff comes under control with the CDS Inline Unit. Placed on the main storm drain within one manhole, its unique configuration meets multiple engineering objectives by combining both treatment and bypass capabilities in one structure. By utilizing the CDS' patented non-blocking screening technology, the Inline Unit ensures removal of both fine and suspended solids along with oil, grease, trash and debris.

Offering a remarkably small footprint, the Inline Unit can be incorporated into new development projects or retrofitted into existing storm water collection systems. The unit is totally underground, has no moving parts and requires no supporting infrastructure.

Process

Developed to complement CDS' offline storm water treatment uses continuous deflective separation (CDS) technology.

A channeling weir collects the flow for entrance into the separation chamber.
Storm water enters the diversion chamber.
The natural vortex in the separation chamber separates suspended and fine sediments to the center of the chamber for eventual settling in the sump.
Because of the washing vortex, the patented separation screen will not become blocked and screened liquid passes through.
After flowing beneath the oil baffle, screened flow discharges from the unit.

Advantages

One structure meets multiple engineering objectives.
The sump is an important design feature of all CDS units. Sumps prevent scour because deposited material is not stored within the treatment flow path.
Handles treatment flows greater than 20-cfs.
Capable of bypassing flows in excess of 50-cfs.
CDS can customize design for larger treatment and bypass flow events.
The Inline Unit removes 80% of total suspending solids (TSS) as well as 100% of floatables and neutrally buoyant material, plus oil and grease.
Due to its non-blocking screen and non-mechanical function, the Inline Unit is a low maintenance treatment option.

Maintenance

As a general rule, CDS recommends removing solids with a standard vactor truck once a year. Depending on each site's pollutant loading characteristics, more cleanouts may be necessary. Seasonal sump cleanout and annual inspection of the screen surface are typically the only requirements necessary to promote successful and efficient operation of the CDS Inline Unit.

Once access hatch into the CDS unit is opened, the maintenance crew will remove the contents of the sump and separation chamber using a vactor truck as the best cleaning method.

The CDS screen and sump can then be visually inspected for any remaining debris. At this point the procedure is complete. There is no need for manned entry into the unit, which prevents any direct contact with captured materials.

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